/*
 * Common interrupt code for 32 and 64 bit
 */
#include <linux/cpu.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>

#include <asm/apic.h>
#include <asm/io_apic.h>
#include <asm/smp.h>

atomic_t irq_err_count;

/*
 * 'what should we do if we get a hw irq event on an illegal vector'.
 * each architecture has to answer this themselves.
 */
void ack_bad_irq(unsigned int irq)
{
        printk(KERN_ERR "unexpected IRQ trap at vector %02x\n", irq);

#ifdef CONFIG_X86_LOCAL_APIC
        /*
         * Currently unexpected vectors happen only on SMP and APIC.
         * We _must_ ack these because every local APIC has only N
         * irq slots per priority level, and a 'hanging, unacked' IRQ
         * holds up an irq slot - in excessive cases (when multiple
         * unexpected vectors occur) that might lock up the APIC
         * completely.
         * But only ack when the APIC is enabled -AK
         */
        if (cpu_has_apic)
                ack_APIC_irq();
#endif
}

#ifdef CONFIG_X86_32
# define irq_stats(x)           (&per_cpu(irq_stat, x))
#else
# define irq_stats(x)           cpu_pda(x)
#endif
/*
 * /proc/interrupts printing:
 */
static int show_other_interrupts(struct seq_file *p)
{
        int j;

        seq_printf(p, "NMI: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->__nmi_count);
        seq_printf(p, "  Non-maskable interrupts\n");
#ifdef CONFIG_X86_LOCAL_APIC
        seq_printf(p, "LOC: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->apic_timer_irqs);
        seq_printf(p, "  Local timer interrupts\n");
#endif
#ifdef CONFIG_SMP
        seq_printf(p, "RES: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->irq_resched_count);
        seq_printf(p, "  Rescheduling interrupts\n");
        seq_printf(p, "CAL: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->irq_call_count);
        seq_printf(p, "  Function call interrupts\n");
        seq_printf(p, "TLB: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->irq_tlb_count);
        seq_printf(p, "  TLB shootdowns\n");
#endif
#ifdef CONFIG_X86_MCE
        seq_printf(p, "TRM: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->irq_thermal_count);
        seq_printf(p, "  Thermal event interrupts\n");
# ifdef CONFIG_X86_64
        seq_printf(p, "THR: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->irq_threshold_count);
        seq_printf(p, "  Threshold APIC interrupts\n");
# endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
        seq_printf(p, "SPU: ");
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", irq_stats(j)->irq_spurious_count);
        seq_printf(p, "  Spurious interrupts\n");
#endif
        seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
        seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
#endif
        return 0;
}

int show_interrupts(struct seq_file *p, void *v)
{
        unsigned long flags, any_count = 0;
        int i = *(loff_t *) v, j;
        struct irqaction *action;
        struct irq_desc *desc;

        if (i > nr_irqs)
                return 0;

        if (i == nr_irqs)
                return show_other_interrupts(p);

        /* print header */
        if (i == 0) {
                seq_printf(p, "           ");
                for_each_online_cpu(j)
                        seq_printf(p, "CPU%-8d", j);
                seq_putc(p, '\n');
        }

        desc = irq_to_desc(i);
        spin_lock_irqsave(&desc->lock, flags);
#ifndef CONFIG_SMP
        any_count = kstat_irqs(i);
#else
        for_each_online_cpu(j)
                any_count |= kstat_irqs_cpu(i, j);
#endif
        action = desc->action;
        if (!action && !any_count)
                goto out;

        seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
        seq_printf(p, "%10u ", kstat_irqs(i));
#else
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", kstat_irqs_cpu(i, j));
#endif
        seq_printf(p, " %8s", desc->chip->name);
        seq_printf(p, "-%-8s", desc->name);

        if (action) {
                seq_printf(p, "  %s", action->name);
                while ((action = action->next) != NULL)
                        seq_printf(p, ", %s", action->name);
        }

        seq_putc(p, '\n');
out:
        spin_unlock_irqrestore(&desc->lock, flags);
        return 0;
}

/*
 * /proc/stat helpers
 */
u64 arch_irq_stat_cpu(unsigned int cpu)
{
        u64 sum = irq_stats(cpu)->__nmi_count;

#ifdef CONFIG_X86_LOCAL_APIC
        sum += irq_stats(cpu)->apic_timer_irqs;
#endif
#ifdef CONFIG_SMP
        sum += irq_stats(cpu)->irq_resched_count;
        sum += irq_stats(cpu)->irq_call_count;
        sum += irq_stats(cpu)->irq_tlb_count;
#endif
#ifdef CONFIG_X86_MCE
        sum += irq_stats(cpu)->irq_thermal_count;
# ifdef CONFIG_X86_64
        sum += irq_stats(cpu)->irq_threshold_count;
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
        sum += irq_stats(cpu)->irq_spurious_count;
#endif
        return sum;
}

u64 arch_irq_stat(void)
{
        u64 sum = atomic_read(&irq_err_count);

#ifdef CONFIG_X86_IO_APIC
        sum += atomic_read(&irq_mis_count);
#endif
        return sum;
}